Rubber fabric



RUBBER FABRIC.

Specification of Letters Patent.

Patented (lot. 26, 1920.

Application led March 19, 1919. Serial No. 283,541.

To all whom t may concern:

Be it known' that I, JOHN MGI. OGILVIE, subject of the King of Great Britain, and a resident of the city of Toronto, in the county of York and Province of Ontario, Canada, have invented certain new and useful Improveniente in Rubber Fabrics, of which the following is a specification.

This invention relates particularly to fabrics for use in rubber heels, rubber soles, stair treads, mats and the like in which considerable elasticity of the tread surface is essential, which ordinarily makes it impossible to satisfactorily secure the fabric to any surface by the use of nails Without the use of washers or plates to extend the bearing surface of the nails and my object is to devise a fabric which does not require to have any metal Washers or other 'means' for increasing the bearing surface of a nail head embedded therein.

I attain my object by so forming the 'fabric that, though it is integral in structure, different strata differ in composition and therefore in `physical characteristics.

The invention is illustrated in the accompanying drawing which is a cross-section of a piece of material constructed in accordance with my invention.

Assuming the fabric to be intended for use in rubber heels, the lowest stratum 1 Will be formed of an elastic moldable vulcanizable rubber composition superimposed on which is a stratum 2 of moldable vulcanizable rubber composition containing a large proportion of fiber disseminated through its mass. By iberized rubber is generally understood a rubber composition containing a quantity of fiber in an unwoven and generally unspun condition. The fiber in this stratum is sufiicient in quantity so that nail heads Will not draw through it under any ordinary pull to which the fabric may be subjected. On the highly berized stratum a stratum 3 of un-fiberized vulcanizable and moldable rubber composition may be superimposed.

iF or rubber soles and many other articles, and sometimes perhaps in' heels, fiber may be used elsewhere than inthe heavily fiberized nail head engaging stratum. vWhile usually the separate strata will be more or less sharply defined a considerable degree vof utility may be attained if the different strata merge more or less gradually into one another.

The material may be formed in sheets and subsequently cut or else molded to the shape of the finished article. In any case the material after it has been built up as described is suitably vulcanized.

I find that nails may be readily driven through the softer more flexible and more resilient stratum, even though holes may not have been molded therein, until their heads are arrested by the denser, tougher, less flexible and less resilient stratum. Y

This stratum acts in the same Way as the washers commonly employed in rubber heels kor other nailed rubber fabrics.

While useful in all cases Where the material is to be held by nails, screws, bolts,

JOHN MCI. OGILVIE. 

